Cap and shell fastening for lamp-socket casings



W. lLE

CAP AND SHELL FASTENING FOR LAMP SOCKET CASINGS May 25 Filed July 2,1925 fastening v The object of the present invention is to. improve theconstruction of cap and shell. fastenings for lamp socket casings andto.

Patented May 25, 1926.

UNITED srA'rs arsar er WILLIAM Hin on JACKSON, MICHIGAN.

CAP AND SHELL: r s-rmvme ron LAME-SOCKET cAsINes;

The invention relates for lamp socket casings.

provide a simple, practical and eflicient fastening means for securingthe cap to the shell of a lamp socket casing of strong dLlY-i able andcomparatively inexpensive construction designed for use on either key orkeyless sockets and adapted to afford a maxr mum amount of strength forresisting separation of the cap and shell. and capable of effectuallypreventing the same when locked from being separated without breakingthe metal of the fastening means.

A further object of the invention is to provide a cap and shellfastening of this character adapted to enable lamp socket casings tosustain considerable weight without impairing the fastening means.

With these and other objects in view, the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described, illustrated in the accompanying drawing and pointed outin the claims hereto appended, it being understood that various changesin the form, proportion and minor details of construction, within thescope of the claims, may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

In the drawings:

Figure 1 is a perspective view of a lamp socket casing constructed inaccordance with this invention, the cap being shown separated from andelevated above the shell or body portion of the casing.

Fig. 2 is a vertical sectional view of the same, the cap being shownseparated from the body portion and properly positioned for interlockingthe cap with the shell.

Fig. 3 is a similar view of the cap and shell showing the sameinterlocked.

Fig. 4: is a horizontal sectional view of the same.

In the accompanying drawing in which isv illustrated the preferredembodiment of the invention 1 designates the metallic shell or bodyportion of the lamp socket casing provided at its upper end which istelescopically engaged by the flange 2 of the cap 3 with bayonet slots &preferably four in numer and arranged at diametrically opposite pointsand composed of vertical entrance to a cap and shell Application filedJuly 2', 1925. Serial No. 41,207.

branches and horizontal; branches extend lng from the lower ends of thevertical.

branches. The upper end of the metallic shell is adapted to fit withinthe flange 2 of the metallic cap 3 which is provided at diametricallyopposite points with inwardly extending horizontally .disposedresilienttongues 5 formed integral "with the cap by partially severingthe metal at the lower edge thereof and bent inwardly to provide aninner arm 6 and having the terminal portion 7 bent outwardly to form anouter arm. The tongues thus consist of inner and outer arms and aconnecting portion and the vertical branches of the L- shaped bayonetslots 4 are of suflicient width to permit the tongues 5 to enter theslots when the cap is moved telescopically over the upper end of theshell. This movement of the cap will bring the tongues to the horizontalbranches of the slots and the cap is then partially rotated to the rightwith respect to the shell to carry the tongues away from the verticalbranches of the slots into the horizontal branches which are closed atthe inner ends as shown. The edges of the tongues will engage with theshell at the upper edges of the slots and will resist any tendency toseparate the cap from the shell by moving the parts telescopically orlongitudinally without previously rotating the same to return thetongues to the entrance portions of the slots. The fastening device isthus provided of considerable strength and will enable the lamp socketcasing to carry a relatively large amount of weight. The cap and shellFICE. i. j

of'the flange 2.

are adapted to be readily engaged with each I slots 4 and is arranged inspaced relation with the same so that the cap may be placed on the shellin any position in which the tongues will register with the entranceslots and the single projection 8 will engage the adjacent perforations9 when the cap is partially rotated. In other Words the projection 8 ofthe cap Wlll engage 1n one of the perforations 9. The cap is released bycompressing the shell 1 adjacent the projection 8 and the engagedperforation 9 to disengage the perforation from the projection, Thiswill free the cap and enable the cap to be partially rotated to returnthe tongues to the entrance branches of the slots and allow the cap tobe readily pulled off the shell.

What I claim is:

A cap and shell fastening for lamp socket casings comprising ashellprovided with a plurality of slots having approximately "ertical andhorizontal branches, the vertical branches forming an entrance, a caphaving a flange to fit over the shell and prorided with integral tongueshaving free terminals at one end extending substantially horizontal andbeing of a length to pass through the entrance portions of the slots andbent inwardly to offset the body portions of the tongues and presenttheir edges for engaging the upper edges of the horizontal branches ofthe slots, said tongues being carried into the horizontal branches by apartial relative rotary movement of the parts and the free terminals ofthe tongues being bent outwardly and gripping the shell interiorlythereof at points beyond the horizontal slots, and means for locking theparts against such relative rotary movement.

In testimony whereof I have hereunto, set

my hand.

WILLIAM ILE.

